You would have damaged the power supply section but in many cases the front end contains a surge protector with a variator which will short and blow the fuse. So check fuse replace and check for short in the input circuit of the power supply, if the Switch mode is damaged then you need to replace the unit with a 220 volt type or if only the 110 type is available then use a step down transformer to down the mains to 110V with about 0.5Amps
SOURCE: WA71N2 plugged to 220V should be 110V
The Fuse for these model is 110V - 250V, so definitely the machine will still light up for a moment then black out. So if you accidentally plugged it to 220V (if it is 110V) you have to change the whole PCB. Electric current are distributed by PCB which only handles 110V.
I suggest when you change the PCB try to change also the Fuse to 110V only so that next time if by accident it was plugged to 220V you just have to change the Fuse not the PCB.
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SOURCE: Samsung WA71N2, plugged to 220V should be 110V only
chang the board! servise center will charge probably 400sr
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